求帮助如何用python对多维数组排序

现有一个三维数组pre（time，lat，lon），大小是（92，65，81），想要对65*81所有格点的降水数据进行从小到大排序，再根据排序对每个格点计算其95百分位，想请问大家是怎样的一个思路呢，具体用到什么函数呀？实在想不出了。求帮助。

$array = array(
    array('id' => 101, 'bid' => 0.5, 'priority' => 5),
    array('id' => 102, 'bid' => 0.4, 'priority' => 4),
    array('id' => 103, 'bid' => 0.4, 'priority' => 4),
    array('id' => 104, 'bid' => 0.4, 'priority' => 4),
    array('id' => 105, 'bid' => 0.3, 'priority' => 5),
    array('id' => 106, 'bid' => 0.3, 'priority' => 5),
    array('id' => 107, 'bid' => 0.2, 'priority' => 5),
    array('id' => 108, 'bid' => 0.7, 'priority' => 5),
    array('id' => 108, 'bid' => 0.1, 'priority' => 4)
);
function cmp(&$a, &$b) {                                     # notice the use of & in function signature
    if ($a['bid'] - $b['bid']) {
        return $a['bid'] - $b['bid'] > 0 ? 1 : -1;           # bid is different, sort using bid
    } else if ($a['priority'] - $b['priority']) {
        return $a['priority'] - $b['priority'] > 0 ? 1 : -1; # priority is different, sort using priority
    } else {
        if (isset($a['rw']) == false) {
            $a['rw'] = rand(1, 100);                         # assign random tie breaker
        } 
        if (isset($b['rw']) == false) {
            $b['rw'] = rand(1, 100);                         # assign random tie breaker
        } 
        if ($a['rw'] - $b['rw']) {
            return $a['rw'] - $b['rw'] > 0 ? 1 : -1;         # sort using random weight
        } else {
            return 0;
        }
    }
}
usort($array, 'cmp');
var_dump($array);